Given your obvious interest in database technology and your exposure to Oracle, their certification program may make sense for your needs. Despite the company's recent difficulties -- which I attribute more to the general world economy than to the company itself -- Oracle remains the biggest of the database vendors and its certifications still have value in the marketplace. You can find more information on the Oracle certs -- out of which collection you would seem to be best suited for the database administrator or DBA credential.
Since you really asked me no specific questions about certification, I'm hard-pressed to provide more than this vague general advice. If you'd care to follow up with something more definite, I'll be happy to respond to further inquiries.
This was first published in May 2003